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Q. A particle of mass $m$ and charge $q$ is incident on $X Z$ plane with velocity $v$ in a direction making angle $\theta$ with a uniform magnetic field applied along $X$-axis. The nature of motion performed by the particle is

Gujarat CETGujarat CET 2017

Solution:

Due to parallel component of velocity to the field particle moves in direction of field and due to perpendicular component of velocity particle follows circular path so combined path is helical